Hello,

To become an IAS, you have to apply for UPSC exam. that's conducted once in a year and come in top ranks to be able to get this service,

You need to attain minimum age of 21 years, and have graduate degree in any stream from a recognized university, even final year students are eligible to apply.

The exam consists of three level-

Preliminary

Mains

Interviews

Preliminary numbers are not added in the final list, you just need to score the required cut offs against your category.It mainly consists of GS Paper-I and CSAT. Both consists of 200 marks, MCQs based.

Mains is more of a subjective type, one needs to write answer for Four General Studies Paper,Two Optionals, One Essay, two language paper, there are total nine papers here. 250 marks for each paper, total is 1750

Finally, comes Interview part for which is of 275 marks.

You can start your preparation from now onward with gradual steps mentioned below-

Be well acquainted with UPSC Syllabus, learn it by heart, that's the most crucial step to crack this exam, to know what to read and what to skip

Read any newspaper like The Hindu, or Indian Express on a regular basis to be updated as well as gaining knowledge which shall be highly useful to you in future exam preparation part.

Start with basics, for each subject, you can do with NCERTs for this.

As you progress, move on to other books, keep your resources minimum.

Start practicing answer writing in advance, even in a little way, writing mains is a huge task for nine paper, it requires immense practice along with knowledge.